The National Weather Service has issued an air stagnation warning in effect until Monday afternoon.
The warning covers northeastern Oregon and southeastern Washington east of The Dalles and as far south as John Day.
Air quality is expected to be moderate Friday evening and continue to deteriorate until Monday at 5 p.m. Winds of less than 10 miles per hour combined with other weather factors mean pollution “has the potential to increase to dangerous levels” near the ground, according to the advisory.
Persons with respiratory illness should follow their physician’s advice for dealing with high levels of air pollution. Outdoor burning is discouraged and residential wood burning devices should be “limited as much as possible.”